Nitrogen fixation, Conversion of atmospheric nitrogen into nitrates or ammonia, Nitrogen-fixing bacteria, Bacteria that convert nitrogen gas into a usable form for plants, Legumes, Plants with root nodules containing nitrogen-fixing bacteria, Mutualism (symbiosis), Both organisms benefit from the relationship, Decomposition, the breakdown of dead organic matter , Nitrification, Conversion of ammonia into nitrites and nitrates, Nitrifying bacteria, Bacteria that carry out nitrification, Denitrification, Conversion of nitrates back into atmospheric nitrogen, Denitrifying bacteria, Bacteria that return nitrogen to the atmosphere.

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